The M992 field artillery ammunition supply vehicle (FAASV) is built on the chassis of the M109 howitzer.

This ammunition vehicle has no turret, but has a taller superstructure to store 90-95 rounds (depending on the model) with a corresponding number of powders and primers.

Until recently, much of the remaining internal crew space was taken up by a hydraulically-powered conveyor system designed to allow the quick uploading of rounds or their transfer to the M109-series howitzer.

Most early models had an additional mechanism called an X-Y Conveyor to lift the rounds into the honeycomb-like storage racks in the front of the superstructure.

The hydraulic conveyor system is usually removed by crews, as it is slower than moving the rounds by hand.